| 1. | a word, line, verse, number, sentence, etc., reading the same backward as forward, as Madam, I'm Adam or Poor Dan is in a droop. |
| 2. | Biochemistry. a region of DNA in which the sequence of nucleotides is identical with an inverted sequence in the complementary strand: GAATTC is a palindrome of CTTAAG. |

palindrome pal·in·drome (pāl'ĭn-drōm')
n.
A segment of double-stranded DNA in which the nucleotide sequence of one strand reads in reverse order to that of the complementary strand.